Multiple V-2 rockets would have launched the “Silver Bird” on a two mile long track, getting high up in the atmosphere before it’s internal rocket engines would have pushed it to Mach 30. It was to skip off the upper atmosphere, using an early lifting body design, dropping down to drop a payload of four nuclear bombs, and then continuing to land in the Japanese held Pacific Ocean.

That was the theory anyway. Pesky things, like opening up a second front with the Russians, kept this design from getting off the drawing board.